他用盒子顶住门，让门开著。

He used a box to prop the door open.

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门被一个凳子顶住了。

A stool had been jammed against the door.

《牛津词典》

电动门滑动控制机构工作过程如下：有电时，齿轮与齿条啮合，由于摆块顶住齿条使管状电机带动外套管转动。

The sliding door control mechanism works as follows: when there is electricity, the gear and rack meshing, as the pendulum block against the rack to drive the outer tube tube motor rotation.

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